535 lines
18 KiB
Rust
535 lines
18 KiB
Rust
use gpui::{
|
|
fill, point, px, relative, size, Bounds, Corners, Element, ElementId, ElementInputHandler,
|
|
GlobalElementId, IntoElement, LayoutId, MouseButton, MouseMoveEvent, PaintQuad, Path, Pixels,
|
|
Point, Style, TextRun, UnderlineStyle, View, WindowContext, WrappedLine,
|
|
};
|
|
use smallvec::SmallVec;
|
|
|
|
use crate::theme::ActiveTheme as _;
|
|
|
|
use super::TextInput;
|
|
|
|
const RIGHT_MARGIN: Pixels = px(5.);
|
|
const CURSOR_INSET: Pixels = px(0.5);
|
|
|
|
pub(super) struct TextElement {
|
|
input: View<TextInput>,
|
|
}
|
|
|
|
impl TextElement {
|
|
pub(super) fn new(input: View<TextInput>) -> Self {
|
|
Self { input }
|
|
}
|
|
|
|
fn paint_mouse_listeners(&mut self, cx: &mut WindowContext) {
|
|
cx.on_mouse_event({
|
|
let input = self.input.clone();
|
|
|
|
move |event: &MouseMoveEvent, _, cx| {
|
|
if event.pressed_button == Some(MouseButton::Left) {
|
|
input.update(cx, |input, cx| {
|
|
input.on_drag_move(event, cx);
|
|
});
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
fn layout_cursor(
|
|
&self,
|
|
lines: &[WrappedLine],
|
|
line_height: Pixels,
|
|
bounds: &mut Bounds<Pixels>,
|
|
cx: &mut WindowContext,
|
|
) -> (Option<PaintQuad>, Point<Pixels>) {
|
|
let input = self.input.read(cx);
|
|
let selected_range = &input.selected_range;
|
|
let cursor_offset = input.cursor_offset();
|
|
let mut scroll_offset = input.scroll_handle.offset();
|
|
let mut cursor = None;
|
|
|
|
// The cursor corresponds to the current cursor position in the text no only the line.
|
|
let mut cursor_pos = None;
|
|
let mut cursor_start = None;
|
|
let mut cursor_end = None;
|
|
|
|
let mut prev_lines_offset = 0;
|
|
let mut offset_y = px(0.);
|
|
for line in lines.iter() {
|
|
// break loop if all cursor positions are found
|
|
if cursor_pos.is_some() && cursor_start.is_some() && cursor_end.is_some() {
|
|
break;
|
|
}
|
|
|
|
let line_origin = point(px(0.), offset_y);
|
|
if cursor_pos.is_none() {
|
|
let offset = cursor_offset.saturating_sub(prev_lines_offset);
|
|
if let Some(pos) = line.position_for_index(offset, line_height) {
|
|
cursor_pos = Some(line_origin + pos);
|
|
}
|
|
}
|
|
if cursor_start.is_none() {
|
|
let offset = selected_range.start.saturating_sub(prev_lines_offset);
|
|
if let Some(pos) = line.position_for_index(offset, line_height) {
|
|
cursor_start = Some(line_origin + pos);
|
|
}
|
|
}
|
|
if cursor_end.is_none() {
|
|
let offset = selected_range.end.saturating_sub(prev_lines_offset);
|
|
if let Some(pos) = line.position_for_index(offset, line_height) {
|
|
cursor_end = Some(line_origin + pos);
|
|
}
|
|
}
|
|
|
|
offset_y += line.size(line_height).height;
|
|
// +1 for skip the last `\n`
|
|
prev_lines_offset += line.len() + 1;
|
|
}
|
|
|
|
if let (Some(cursor_pos), Some(cursor_start), Some(cursor_end)) =
|
|
(cursor_pos, cursor_start, cursor_end)
|
|
{
|
|
let cursor_moved = input.last_cursor_offset != Some(cursor_offset);
|
|
let selection_changed = input.last_selected_range != Some(selected_range.clone());
|
|
|
|
if cursor_moved || selection_changed {
|
|
scroll_offset.x =
|
|
if scroll_offset.x + cursor_pos.x > (bounds.size.width - RIGHT_MARGIN) {
|
|
// cursor is out of right
|
|
bounds.size.width - RIGHT_MARGIN - cursor_pos.x
|
|
} else if scroll_offset.x + cursor_pos.x < px(0.) {
|
|
// cursor is out of left
|
|
scroll_offset.x - cursor_pos.x
|
|
} else {
|
|
scroll_offset.x
|
|
};
|
|
scroll_offset.y = if scroll_offset.y + cursor_pos.y > (bounds.size.height) {
|
|
// cursor is out of bottom
|
|
bounds.size.height - cursor_pos.y
|
|
} else if scroll_offset.y + cursor_pos.y < px(0.) {
|
|
// cursor is out of top
|
|
scroll_offset.y - cursor_pos.y
|
|
} else {
|
|
scroll_offset.y
|
|
};
|
|
|
|
if input.selection_reversed {
|
|
if scroll_offset.x + cursor_start.x < px(0.) {
|
|
// selection start is out of left
|
|
scroll_offset.x = -cursor_start.x;
|
|
}
|
|
if scroll_offset.y + cursor_start.y < px(0.) {
|
|
// selection start is out of top
|
|
scroll_offset.y = -cursor_start.y;
|
|
}
|
|
} else {
|
|
if scroll_offset.x + cursor_end.x <= px(0.) {
|
|
// selection end is out of left
|
|
scroll_offset.x = -cursor_end.x;
|
|
}
|
|
if scroll_offset.y + cursor_end.y <= px(0.) {
|
|
// selection end is out of top
|
|
scroll_offset.y = -cursor_end.y;
|
|
}
|
|
}
|
|
}
|
|
|
|
bounds.origin += scroll_offset;
|
|
|
|
if input.show_cursor(cx) {
|
|
// cursor blink
|
|
cursor = Some(fill(
|
|
Bounds::new(
|
|
point(
|
|
bounds.left() + cursor_pos.x,
|
|
bounds.top() + cursor_pos.y + CURSOR_INSET,
|
|
),
|
|
size(px(1.5), line_height),
|
|
),
|
|
crate::blue_500(),
|
|
))
|
|
};
|
|
}
|
|
|
|
(cursor, scroll_offset)
|
|
}
|
|
|
|
fn layout_selections(
|
|
&self,
|
|
lines: &[WrappedLine],
|
|
line_height: Pixels,
|
|
bounds: &mut Bounds<Pixels>,
|
|
cx: &mut WindowContext,
|
|
) -> Option<Path<Pixels>> {
|
|
let input = self.input.read(cx);
|
|
let selected_range = &input.selected_range;
|
|
if selected_range.is_empty() {
|
|
return None;
|
|
}
|
|
|
|
let (start_ix, end_ix) = if selected_range.start < selected_range.end {
|
|
(selected_range.start, selected_range.end)
|
|
} else {
|
|
(selected_range.end, selected_range.start)
|
|
};
|
|
|
|
let mut prev_lines_offset = 0;
|
|
let mut line_corners = vec![];
|
|
|
|
let mut offset_y = px(0.);
|
|
for line in lines.iter() {
|
|
let line_size = line.size(line_height);
|
|
let line_wrap_width = line_size.width;
|
|
|
|
let line_origin = point(px(0.), offset_y);
|
|
|
|
let line_cursor_start =
|
|
line.position_for_index(start_ix.saturating_sub(prev_lines_offset), line_height);
|
|
let line_cursor_end =
|
|
line.position_for_index(end_ix.saturating_sub(prev_lines_offset), line_height);
|
|
|
|
if line_cursor_start.is_some() || line_cursor_end.is_some() {
|
|
let start = line_cursor_start
|
|
.unwrap_or_else(|| line.position_for_index(0, line_height).unwrap());
|
|
|
|
let end = line_cursor_end
|
|
.unwrap_or_else(|| line.position_for_index(line.len(), line_height).unwrap());
|
|
|
|
// Split the selection into multiple items
|
|
let wrapped_lines =
|
|
(end.y / line_height).ceil() as usize - (start.y / line_height).ceil() as usize;
|
|
|
|
let mut end_x = end.x;
|
|
if wrapped_lines > 0 {
|
|
end_x = line_wrap_width;
|
|
}
|
|
|
|
line_corners.push(Corners {
|
|
top_left: line_origin + point(start.x, start.y),
|
|
top_right: line_origin + point(end_x, start.y),
|
|
bottom_left: line_origin + point(start.x, start.y + line_height),
|
|
bottom_right: line_origin + point(end_x, start.y + line_height),
|
|
});
|
|
|
|
// wrapped lines
|
|
for i in 1..=wrapped_lines {
|
|
let start = point(px(0.), start.y + i as f32 * line_height);
|
|
let mut end = point(end.x, end.y + i as f32 * line_height);
|
|
if i < wrapped_lines {
|
|
end.x = line_size.width;
|
|
}
|
|
|
|
line_corners.push(Corners {
|
|
top_left: line_origin + point(start.x, start.y),
|
|
top_right: line_origin + point(end.x, start.y),
|
|
bottom_left: line_origin + point(start.x, start.y + line_height),
|
|
bottom_right: line_origin + point(end.x, start.y + line_height),
|
|
});
|
|
}
|
|
}
|
|
|
|
if line_cursor_start.is_some() && line_cursor_end.is_some() {
|
|
break;
|
|
}
|
|
|
|
offset_y += line_size.height;
|
|
// +1 for skip the last `\n`
|
|
prev_lines_offset += line.len() + 1;
|
|
}
|
|
|
|
let mut points = vec![];
|
|
if line_corners.is_empty() {
|
|
return None;
|
|
}
|
|
|
|
// Fix corners to make sure the left to right direction
|
|
for corners in &mut line_corners {
|
|
if corners.top_left.x > corners.top_right.x {
|
|
std::mem::swap(&mut corners.top_left, &mut corners.top_right);
|
|
std::mem::swap(&mut corners.bottom_left, &mut corners.bottom_right);
|
|
}
|
|
}
|
|
|
|
for corners in &line_corners {
|
|
points.push(corners.top_right);
|
|
points.push(corners.bottom_right);
|
|
points.push(corners.bottom_left);
|
|
}
|
|
|
|
let mut rev_line_corners = line_corners.iter().rev().peekable();
|
|
while let Some(corners) = rev_line_corners.next() {
|
|
points.push(corners.top_left);
|
|
if let Some(next) = rev_line_corners.peek() {
|
|
if next.top_left.x > corners.top_left.x {
|
|
points.push(point(next.top_left.x, corners.top_left.y));
|
|
}
|
|
}
|
|
}
|
|
|
|
// print_points_as_svg_path(&line_corners, &points);
|
|
|
|
let first_p = *points.first().unwrap();
|
|
let mut path = gpui::Path::new(bounds.origin + first_p);
|
|
for p in points.iter().skip(1) {
|
|
path.line_to(bounds.origin + *p);
|
|
}
|
|
Some(path)
|
|
}
|
|
}
|
|
|
|
pub(super) struct PrepaintState {
|
|
lines: SmallVec<[WrappedLine; 1]>,
|
|
cursor: Option<PaintQuad>,
|
|
cursor_scroll_offset: Point<Pixels>,
|
|
selection_path: Option<Path<Pixels>>,
|
|
bounds: Bounds<Pixels>,
|
|
}
|
|
|
|
impl IntoElement for TextElement {
|
|
type Element = Self;
|
|
|
|
fn into_element(self) -> Self::Element {
|
|
self
|
|
}
|
|
}
|
|
|
|
/// A debug function to print points as SVG path.
|
|
#[allow(unused)]
|
|
fn print_points_as_svg_path(line_corners: &Vec<Corners<Point<Pixels>>>, points: &[Point<Pixels>]) {
|
|
for corners in line_corners {
|
|
println!(
|
|
"tl: ({}, {}), tr: ({}, {}), bl: ({}, {}), br: ({}, {})",
|
|
corners.top_left.x.0 as i32,
|
|
corners.top_left.y.0 as i32,
|
|
corners.top_right.x.0 as i32,
|
|
corners.top_right.y.0 as i32,
|
|
corners.bottom_left.x.0 as i32,
|
|
corners.bottom_left.y.0 as i32,
|
|
corners.bottom_right.x.0 as i32,
|
|
corners.bottom_right.y.0 as i32,
|
|
);
|
|
}
|
|
|
|
if !points.is_empty() {
|
|
println!("M{},{}", points[0].x.0 as i32, points[0].y.0 as i32);
|
|
for p in points.iter().skip(1) {
|
|
println!("L{},{}", p.x.0 as i32, p.y.0 as i32);
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Element for TextElement {
|
|
type RequestLayoutState = ();
|
|
type PrepaintState = PrepaintState;
|
|
|
|
fn id(&self) -> Option<ElementId> {
|
|
None
|
|
}
|
|
|
|
fn request_layout(
|
|
&mut self,
|
|
_id: Option<&GlobalElementId>,
|
|
cx: &mut WindowContext,
|
|
) -> (LayoutId, Self::RequestLayoutState) {
|
|
let input = self.input.read(cx);
|
|
let mut style = Style::default();
|
|
style.size.width = relative(1.).into();
|
|
if self.input.read(cx).is_multi_line() {
|
|
style.size.height = relative(1.).into();
|
|
style.min_size.height = (input.rows.max(1) as f32 * cx.line_height()).into();
|
|
} else {
|
|
style.size.height = cx.line_height().into();
|
|
};
|
|
(cx.request_layout(style, []), ())
|
|
}
|
|
|
|
fn prepaint(
|
|
&mut self,
|
|
_id: Option<&GlobalElementId>,
|
|
bounds: Bounds<Pixels>,
|
|
_request_layout: &mut Self::RequestLayoutState,
|
|
cx: &mut WindowContext,
|
|
) -> Self::PrepaintState {
|
|
let multi_line = self.input.read(cx).is_multi_line();
|
|
let line_height = cx.line_height();
|
|
let input = self.input.read(cx);
|
|
let text = input.text.clone();
|
|
let placeholder = input.placeholder.clone();
|
|
let style = cx.text_style();
|
|
let mut bounds = bounds;
|
|
|
|
let (display_text, text_color) = if text.is_empty() {
|
|
(placeholder, cx.theme().muted_foreground)
|
|
} else if input.masked {
|
|
(
|
|
"*".repeat(text.chars().count()).into(),
|
|
cx.theme().foreground,
|
|
)
|
|
} else {
|
|
(text, cx.theme().foreground)
|
|
};
|
|
|
|
let run = TextRun {
|
|
len: display_text.len(),
|
|
font: style.font(),
|
|
color: text_color,
|
|
background_color: None,
|
|
underline: None,
|
|
strikethrough: None,
|
|
};
|
|
|
|
let runs = if let Some(marked_range) = input.marked_range.as_ref() {
|
|
vec![
|
|
TextRun {
|
|
len: marked_range.start,
|
|
..run.clone()
|
|
},
|
|
TextRun {
|
|
len: marked_range.end - marked_range.start,
|
|
underline: Some(UnderlineStyle {
|
|
color: Some(run.color),
|
|
thickness: px(1.0),
|
|
wavy: false,
|
|
}),
|
|
..run.clone()
|
|
},
|
|
TextRun {
|
|
len: display_text.len() - marked_range.end,
|
|
..run.clone()
|
|
},
|
|
]
|
|
.into_iter()
|
|
.filter(|run| run.len > 0)
|
|
.collect()
|
|
} else {
|
|
vec![run]
|
|
};
|
|
|
|
let font_size = style.font_size.to_pixels(cx.rem_size());
|
|
let wrap_width = if multi_line {
|
|
Some(bounds.size.width - RIGHT_MARGIN)
|
|
} else {
|
|
None
|
|
};
|
|
|
|
let lines = cx
|
|
.text_system()
|
|
.shape_text(display_text, font_size, &runs, wrap_width)
|
|
.unwrap();
|
|
|
|
// `position_for_index` for example
|
|
//
|
|
// #### text
|
|
//
|
|
// Hello 世界，this is GPUI component.
|
|
// The GPUI Component is a collection of UI components for
|
|
// GPUI framework, including Button, Input, Checkbox, Radio,
|
|
// Dropdown, Tab, and more...
|
|
//
|
|
// wrap_width: 444px, line_height: 20px
|
|
//
|
|
// #### lines[0]
|
|
//
|
|
// | index | pos | line |
|
|
// |-------|------------------|------|
|
|
// | 5 | (37 px, 0.0) | 0 |
|
|
// | 38 | (261.7 px, 20.0) | 0 |
|
|
// | 40 | None | - |
|
|
//
|
|
// #### lines[1]
|
|
//
|
|
// | index | position | line |
|
|
// |-------|-----------------------|------|
|
|
// | 5 | (43.578125 px, 0.0) | 0 |
|
|
// | 56 | (422.21094 px, 0.0) | 0 |
|
|
// | 57 | (11.6328125 px, 20.0) | 1 |
|
|
// | 114 | (429.85938 px, 20.0) | 1 |
|
|
// | 115 | (11.3125 px, 40.0) | 2 |
|
|
|
|
// Calculate the scroll offset to keep the cursor in view
|
|
|
|
let (cursor, cursor_scroll_offset) =
|
|
self.layout_cursor(&lines, line_height, &mut bounds, cx);
|
|
|
|
let selection_path = self.layout_selections(&lines, line_height, &mut bounds, cx);
|
|
|
|
PrepaintState {
|
|
bounds,
|
|
lines,
|
|
cursor,
|
|
cursor_scroll_offset,
|
|
selection_path,
|
|
}
|
|
}
|
|
|
|
fn paint(
|
|
&mut self,
|
|
_id: Option<&GlobalElementId>,
|
|
input_bounds: Bounds<Pixels>,
|
|
_request_layout: &mut Self::RequestLayoutState,
|
|
prepaint: &mut Self::PrepaintState,
|
|
cx: &mut WindowContext,
|
|
) {
|
|
let focus_handle = self.input.read(cx).focus_handle.clone();
|
|
let focused = focus_handle.is_focused(cx);
|
|
let bounds = prepaint.bounds;
|
|
let selected_range = self.input.read(cx).selected_range.clone();
|
|
|
|
cx.handle_input(
|
|
&focus_handle,
|
|
ElementInputHandler::new(bounds, self.input.clone()),
|
|
);
|
|
|
|
// Paint selections
|
|
if let Some(path) = prepaint.selection_path.take() {
|
|
cx.paint_path(path, cx.theme().selection);
|
|
}
|
|
|
|
// Paint multi line text
|
|
let line_height = cx.line_height();
|
|
let origin = bounds.origin;
|
|
|
|
let mut offset_y = px(0.);
|
|
for line in prepaint.lines.iter() {
|
|
let p = point(origin.x, origin.y + offset_y);
|
|
_ = line.paint(p, line_height, cx);
|
|
offset_y += line.size(line_height).height;
|
|
}
|
|
|
|
if focused {
|
|
if let Some(cursor) = prepaint.cursor.take() {
|
|
cx.paint_quad(cursor);
|
|
}
|
|
}
|
|
|
|
let width = prepaint
|
|
.lines
|
|
.iter()
|
|
.map(|l| l.width())
|
|
.max()
|
|
.unwrap_or_default();
|
|
let height = prepaint
|
|
.lines
|
|
.iter()
|
|
.map(|l| l.size(line_height).height.0)
|
|
.sum::<f32>();
|
|
|
|
let scroll_size = size(width, px(height));
|
|
|
|
self.input.update(cx, |input, _cx| {
|
|
input.last_layout = Some(prepaint.lines.clone());
|
|
input.last_bounds = Some(bounds);
|
|
input.last_cursor_offset = Some(input.cursor_offset());
|
|
input.last_line_height = line_height;
|
|
input.input_bounds = input_bounds;
|
|
input.last_selected_range = Some(selected_range);
|
|
input
|
|
.scroll_handle
|
|
.set_offset(prepaint.cursor_scroll_offset);
|
|
input.scroll_size = scroll_size;
|
|
});
|
|
|
|
self.paint_mouse_listeners(cx);
|
|
}
|
|
}
|